I wanted to say Optimus and Arcee holding hands as they were about to die in "Scrapheap", but then Raf nearly dying in "One Shall Fall" had me on the verge of tears too. Damn the polls for not having multichoices. TTwTT

Miko's tears in Rock Bottom: Have to admit that it pulled my heart strings a bit.

Arcee's remorse of what she did in the end of Partners: Showing her guilt like that in the end is both sad and touching.

Arcee Cybertron Speech in Orion Pax part 2: Have to say that what she said was pretty moving about Cybertron's death. You can tell it affected her and others.

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Those "Predatory" flashbacks must've just been the first scene(s) to come to mind for me. ^These were all very effective for me as well.^

Another thing from "Partners," even though it's just a quick moment rather than a scene: That sad/angry yell Arcee does right before her last "This is for Cliffjumper!" hit against Starscream always gets to me.

I think the saddest scene was when Megatron was trying to reach out his hand to grab the zombie bot, but then the whole bridge blew up. It was sad seeing them all the zombies implode. All of Megatrons time and investment down the drain in a couple of seconds.

Optimus and Arcee go "It has been an honor." in the ice wins, you can really see the two old warriors letting the lights go out.

But one scene I find particularly sad is Starscream on Partners: it's sad to see his utter desperation to belong to something, specially the scene where he talks to Arcee "Okay, okay, it was mistake! I made many! I'm one of new now!" the utter desperation on his voice just...gets me. every time.

Out of the pole options, OP and Arcee. Initially, I didn't find it that sad. Maybe because I knew they would survive but when rewatching, it's actually pretty sad.

Cliff memorial is second place for me. But the scene I found the saddest the first time watching it was Arcee talking to Cliff in Partners. IDK why but I found that pretty sad.

As for the other options, they never really made me that sad. I still don't enjoy rock bottom because I found it boring and everything in OSF, including Rafs near death experience, was ridicules. I was actually hoping Bulkhead would die in TMI and I found the scenes in partners to be more chilling than sad. I knew Arcee would live in Darkness Rising part 5.

T.M.I., easily. I honestly wasn't sure we'd see Bulk back. The first four I didn't feel anything, because there was no real danger of losing any of the main cast (yet), especially since it was still early. I knew Arcee wouldn't die because they already killed Cliff for that purpose (but if he died in that scene, instead of the beginning, it would've had a LOT more impact). Rock Bottom was just "deal with it, Miko".

One Shall Fall was actually an emotion jerker, I got worried for Raf, I really felt for Bee, but I wasn't sad, just "wow, shit got real".

But with T.M.I., I knew the possibility was very real that Bulk may not've come out of it, I honestly teared up (yeah, the 6'2'', drunkard metalhead with a "Satanic" sig at the moment teared up a tad) thinking we just saw a real casualty in this war. Cliff died, but he was a redshirt, Bulk was someone we knew.